A microleakage study of gutta-percha/AH Plus and Resilon/Real self-etch systems after different irrigation protocols

The development and maintenance of the sealing of the root canal system is the key to the success of root canal treatment. The resin-based adhesive material has the potential to reduce the microleakage of the root canal because of its adhesive properties and penetration into dentinal walls. Moreover, the irrigation protocols may have an influence on the adhesiveness of resin-based sealers to root dentin. Objective: The objective of the present study was to evaluate the effect of different irrigant protocols on coronal bacterial microleakage of gutta-percha/AH Plus and Resilon/Real Seal Self-etch systems. Material and Methods: One hundred ninety pre-molars were used. The teeth were divided into 18 experimental groups according to the irrigation protocols and filling materials used. The protocols used were: distilled water; sodium hypochlorite (NaOCl)+eDTA; NaOCl+H3PO4; NaOCl+eDTA+chlorhexidine (CHX); NaOCl+H3PO4+CHX; CHX+eDTA; CHX+ H3PO4; CHX+eDTA+CHX and CHX+H3PO4+CHX. Gutta-percha/AH Plus or Resilon/Real Seal Se were used as root-filling materials. The coronal microleakage was evaluated for 90 days against Enterococcus faecalis. Data were statistically analyzed using Kaplan-Meier survival test, Kruskal-Wallis and Mann-Whitney tests. Results: No significant difference was verified in the groups using chlorhexidine or sodium hypochlorite during the chemo-mechanical preparation followed by eDTA or phosphoric acid for smear layer removal. The same results were found for filling materials. However, the statistical analyses revealed that a final flush with 2% chlorhexidine reduced significantly the coronal microleakage. Conclusion: A final flush with 2% chlorhexidine after smear layer removal reduces coronal microleakage of teeth filled with gutta-percha/AH Plus or Resilon/Real Seal SE

A Microleakage Study Of Gutta-percha/ah Plus And Resilon/real Self-etch Systems After Different Irrigation Protocols.

The development and maintenance of the sealing of the root canal system is the key to the success of root canal treatment. The resin-based adhesive material has the potential to reduce the microleakage of the root canal because of its adhesive properties and penetration into dentinal walls. Moreover, the irrigation protocols may have an influence on the adhesiveness of resin-based sealers to root dentin. The objective of the present study was to evaluate the effect of different irrigant protocols on coronal bacterial microleakage of gutta-percha/AH Plus and Resilon/Real Seal Self-etch systems. One hundred ninety pre-molars were used. The teeth were divided into 18 experimental groups according to the irrigation protocols and filling materials used. The protocols used were: distilled water; sodium hypochlorite (NaOCl)+eDTA; NaOCl+H3PO4; NaOCl+eDTA+chlorhexidine (CHX); NaOCl+H3PO4+CHX; CHX+eDTA; CHX+ H3PO4; CHX+eDTA+CHX and CHX+H3PO4+CHX. Gutta-percha/AH Plus or Resilon/Real Seal Se were used as root-filling materials. The coronal microleakage was evaluated for 90 days against Enterococcus faecalis. Data were statistically analyzed using Kaplan-Meier survival test, Kruskal-Wallis and Mann-Whitney tests. No significant difference was verified in the groups using chlorhexidine or sodium hypochlorite during the chemo-mechanical preparation followed by eDTA or phosphoric acid for smear layer removal. The same results were found for filling materials. However, the statistical analyses revealed that a final flush with 2% chlorhexidine reduced significantly the coronal microleakage. A final flush with 2% chlorhexidine after smear layer removal reduces coronal microleakage of teeth filled with gutta-percha/AH Plus or Resilon/Real Seal SE.22174-

A microleakage study of gutta-percha/AH Plus and Resilon/Real self-etch systems after different irrigation protocols

The development and maintenance of the sealing of the root canal system is the key to the success of root canal treatment. The resin-based adhesive material has the potential to reduce the microleakage of the root canal because of its adhesive properties and penetration into dentinal walls. Moreover, the irrigation protocols may have an influence on the adhesiveness of resin-based sealers to root dentin. Objective: The objective of the present study was to evaluate the effect of different irrigant protocols on coronal bacterial microleakage of gutta-percha/AH Plus and Resilon/Real Seal Self-Etch systems. Material and Methods: One hundred ninety pre-molars were used. The teeth were divided into 18 experimental groups according to the irrigation protocols and filling materials used. The protocols used were: distilled water; sodium hypochlorite (NaOCl)+EDTA; NaOCl+H3PO4; NaOCl+EDTA+chlorhexidine (CHX); NaOCl+H3PO4+CHX; CHX+EDTA; CHX+ H3PO4; CHX+EDTA+CHX and CHX+H3PO4+CHX. Gutta-percha/AH Plus or Resilon/Real Seal SE were used as root-filling materials. The coronal microleakage was evaluated for 90 days against Enterococcus faecalis. Data were statistically analyzed using Kaplan-Meier survival test, Kruskal-Wallis and Mann-Whitney tests. Results: No significant difference was verified in the groups using chlorhexidine or sodium hypochlorite during the chemo-mechanical preparation followed by EDTA or phosphoric acid for smear layer removal. The same results were found for filling materials. However, the statistical analyses revealed that a final flush with 2% chlorhexidine reduced significantly the coronal microleakage. Conclusion: A final flush with 2% chlorhexidine after smear layer removal reduces coronal microleakage of teeth filled with gutta-percha/AH Plus or Resilon/Real Seal SE223174179CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP302575/2009-0sem informação2009/53976-0; 2010/50817-

Composição e método de obtenção de resinas fenólicas e processo de revestimento para superfícies metálicas

DepositadaA presente invenção proporciona uma composição de resinas fenólicas e um método inovador de cura através da geração de Plasma. O referido método é aplicável na cura de uma resina fenólica anticorrosiva do tipo NOVOLAC, termoplástica, à base de LCC aplicada em uma superfície metálica de aço carbono. Não há interrupção do processo de cura e após essa etapa obtém-se um revestimento de elevada estabilidade térmica e com superfície mais rígida, oriundos de um processo de cura mais eficiente e com tecnologia limpa

A Simple Approach for the Synthesis of Gold Nanoparticles Mediated by Layered Double Hydroxide

The present work introduces a new procedure to obtain gold nanoparticles (AuNPs). AuNPs (77–213 nm) were obtained in the absence of any classical reducing agents in a medium containing Mg2+/Al3+ layered double hydroxide (LDH) and N,N-dimethylformamide. XRD analysis showed the presence of crystalline phases of gold in the Au/LDH composite. The 2θ values of peaks corresponding to the LDH interlayer distance indicated that metallic NPs were deposited on the surface of the material. Furthermore, atomic force microscopy (AFM) analysis showed that AuNPs tend to agglomerate in a nonclassical halter-like shape

Curvas de forças entre hematita e quartzo por afm e seu efeito na seletividade do processo de flotação de minério de ferro / Force curves between hematite and quartz by afm and their effect on the selectivity of the iron ore flotation process

Medidas de força de interação entre uma ponta funcionalizada com quartzo e superfícies de hematita e quartzo, em meio líquido (soluções de eletrólito indiferente, amido de milho gelatinizado e mistura de amido de milho gelatinizado e eteramina) foram realizadas utilizando a técnica de microscopia de força atômica. Essas medidas foram ainda comparadas com os estudos de potencial zeta de partículas de quartzo e hematita em função do pH. As curvas de interação entre a ponta funcionalizada de quartzo e a superfície de hematita mostraram forças repulsivas em eletrólito e em pH=10,5. Na presença de amido, a curva de força começa a apresentar uma interação atrativa, que pode ser devido à uma diminuição da repulsão da dupla camada elétrica. As forças de interação entre as superfícies de quartzo (superfície e ponta) foram repulsivas na presença de amido de milho, mostrando que as moléculas de amido não interagem com a superfície do quartzo. De fato, os valores de potencial zeta foram negativos tanto na presença como na ausência de amido. A interação entre ponta funcionalizada de quartzo e a superfície de hematita, na presença da mistura de reagentes, revelou também uma pequena atração a curtas distâncias demonstrando que pode ocorrer uma heterocoagulação

Ligas de Fe-Pt produzidas por eletrodeposição

O presente trabalho foi desenvolvido com o intuito de estudar o magnetismo das ligas de Fe-Pt produzidas por eletrodeposição para aplicação em biomedicina .Por apresentar excelentes propriedades magnéticas e uma excelente biocompatibilidade tornou-se alvo de estudos recentes. Uma das dificuldades encontradas de se produzir esta liga por eletrodeposição é devido ao efeito causado na superfície da amostra pela de composição da água que é acelerada pela presença da platina.Com o objetivo de minimizar o fenômeno da evolução do hidrogênio que ocorre de forma concomitante com o depósito do ferro, resultando em crateras na superfície do depósito, deixando as propriedades magnéticas da liga bastante comprometidas, a busca por novos procedimentos se fez necessária, recentemente G. Zangariet al desenvolveu um procedimento no qual o ferro e a platina são complexados antes da realização do depósito. Com esse procedimento tornou-se possível obter filmes com uma quantidade mínima de defeitos bem como de oxigênio.Baseado neste novo procedimento as ligas de Fe-Pt foram produzidas através da técnica de eletrodeposição e suas propriedades magnéticas,a caracterização topológica e caracterização estrutural foram analisadas por SQUID, MOKE, MEV,AFM e DRX respectivamente no trabalho em questão